Study on extraction technology of polyphenol from Xinjiang pomegranate peel

The experiment of ultrasonic-assisted extraction of polyphenols from Xinjiang pomegranate peel was conducted by the quadratic general rotation combination design.The four parameters which were ethanol concentration,solid-liquid ratio,ultrasonic treating time and ultrasonic power were researched for higher yield of polyphenol.The optimum extraction conditions were that the concentration of ethanol 50%,the ratio of solid to liquid(m:V)1:25,the time of extraction 30min,the ultrasonic power 360 W.Under the above mentioned conditions,the polyphenols yield of pomegranate peel can reach(21.22±0.06)%.